package com.logic.landseaserver.common.util;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.logic.landseaserver.ws.ContractRest;

public class PDF2Image {
	private static final Logger logger = LoggerFactory.getLogger(PDF2Image.class);

    public static void createImg(String sourcePDF, String targetImage) throws IOException {
        logger.info("sourcePDF "+sourcePDF +"targetImage :"+targetImage);
        File pdfFile = new File(sourcePDF);
        logger.info("pdfFile "+pdfFile);
        PDDocument doc = null;
        try{
            doc = PDDocument.load(pdfFile);
        }catch (Exception e){
            logger.info("load pdf is error:"+e.getMessage());
            logger.info("load pdf is error:",e);
        }
        logger.info("load pdf "+doc);
        int pageCount = doc.getNumberOfPages();
        logger.info("pageCount "+pageCount);
        List<BufferedImage> piclist = new ArrayList<>();
        for(int i=0 ; i < pageCount; i++){
            BufferedImage  image = new PDFRenderer(doc).renderImageWithDPI(i,130, ImageType.RGB);
            piclist.add(image);
        }
        logger.info("createImg step ");
        doc.close();
        yPic(piclist,targetImage);
    }

    /**
     * 将宽度相同的图片，竖向追加在一起 ##注意：宽度必须相同
     *
     * @param piclist
     *            文件流数组
     * @param outPath
     *            输出路径
     */
    private static void yPic(List<BufferedImage> piclist, String outPath) {// 纵向处理图片
        logger.info("yPic step ");
        if (piclist == null || piclist.size() <= 0) {
            return;
        }
        try {
            int height = 0, // 总高度
                    width = 0, // 总宽度
                    _height = 0, // 临时的高度 , 或保存偏移高度
                    __height = 0, // 临时的高度，主要保存每个高度
                    picNum = piclist.size();// 图片的数量
            int[] heightArray = new int[picNum]; // 保存每个文件的高度
            BufferedImage buffer = null; // 保存图片流
            List<int[]> imgRGB = new ArrayList<int[]>(); // 保存所有的图片的RGB
            int[] _imgRGB; // 保存一张图片中的RGB数据
            for (int i = 0; i < picNum; i++) {
                buffer = piclist.get(i);
                heightArray[i] = _height = buffer.getHeight();// 图片高度
                if (i == 0) {
                    width = buffer.getWidth();// 图片宽度
                }
                height += _height; // 获取总高度
                _imgRGB = new int[width * _height];// 从图片中读取RGB
                _imgRGB = buffer
                        .getRGB(0, 0, width, _height, _imgRGB, 0, width);
                imgRGB.add(_imgRGB);
            }
            _height = 0; // 设置偏移高度为0
            // 生成新图片
            BufferedImage imageResult = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_BGR);
            for (int i = 0; i < picNum; i++) {
                __height = heightArray[i];
                if (i != 0)
                    _height += __height; // 计算偏移高度
                imageResult.setRGB(0, _height, width, __height, imgRGB.get(i),
                        0, width); // 写入流中
            }
            File outFile = new File(outPath);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(imageResult, "jpg", out);// 写图片
            byte[] b = out.toByteArray();
            FileOutputStream output = new FileOutputStream(outFile);
            output.write(b);
            out.close();
            output.close();
        } catch (Exception e) {
            logger.info("PDF2Image  failure", e);
        	logger.error("PDF2Image  failure", e);
        }
    }

   /*public  static  void main(String[] args)throws IOException{
        createImg("F:\\C11791_20180918140929.pdf"
                ,"F:\\C11791_20180918140929.jpg");
    }*/
}
